Capstone Turbine Corporation • 16640 Stagg Street • Van Nuys • CA 91406 • USA
Installation Guide: Capstone C1000S/C800S/C600S with C1000 Series Controller
480064 Rev C (December 2018) Page 67 of 122
Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without
incurring any obligation either with respect to equipment previously sold or in the process of construction.
3-wire delta utility service connections require a grounding transformer, as
phase-to-ground voltages float and, over time, become unbalanced with respect
to ground which causes microturbine hardware damage and nuisance trips. In
addition, the phase-to-ground voltages reach levels that can break the insulation
in the IGBTs-to-ground and cause equipment failure. Capstone Applications
approval is required for grounding transformer applications.
High power and communication wiring must be run in separate metal grounded
conduits or trays to reduce noise issues.
For Stand Alone or Dual Mode installations, improper phase connections can
damage the connected loads or cause microturbine trips. Capstone cannot be
held responsible for equipment damage caused by improper connections. It is
the installer’s responsibility to verify the proper phase connections between the
microturbine and the load(s). The output phase sequence of the microturbine is
L1 to L2 to L3 (A to B to C).
7.2. Grounding Requirements
7.2.1. Protective Earth (PE) / Chassis Ground
All Capstone microturbines must have protective earth (PE) grounding for the chassis. A separate
ground bar is included in the power connection bay for this purpose. PE grounding is commonly
provided via ground rod installation. The PE for the chassis ground and the ground for the neutral
should be at equivalent potentials, with respect to earth. Use of a single PE connection for multiple
microturbine chassis grounds is acceptable.
PE/chassis grounding can either be a ground rod at each unit, a common ground rod for all units,
or a single, common ground rod at the utility transformer or main distribution panel.
All illustrations in this document indicate the protective earth (PE)/ chassis
ground by “PE/G”.
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